Since I will need to install a logstash with out internet I downloaded the rpm (for version 5.2.0) and wrote "rpm -i ..." without running yum install. LogStash was installed, also after writing a test.conf I was able to run LogStash through command: " ./bin/logstash -f test.conf &". Through ps -ef | grep logstash I saw that LogStash was up.
The problem was when I pressed "service logstash status" etc. I received: " "logstash: unrecognized service".
Any help will be appreciated.